RemoveUnit() What are the rare when instances it leaks?

Apparently, RemoveUnit() doesn't leak unless it runs into one of those rare instances - like the unit being hidden. What are these "rare instances" when RemoveUnit() leaks?

I'd rather not Kill and Remove a unit just to "be safe" because the killing of the unit interferes with some of my other map systems. So therefore, I'd like to know the exact instances of RemoveUnit() leaking so I can specifically avoid them.

Does anyone have a comprehensive list of RemoveUnit()'s weird leaking instances?

I don't even think it's a matter of a leak. I think it just messes up somehow or something. But, it being hidden is the only condition that Blizzard seems to care about. Although that might then make units with 'Aloc' messy too, i don't know.

~Cubasis